package org.eoti.ai.genetic.gp;

import java.util.concurrent.ConcurrentHashMap;

/**
 * The MIT License
 * <p/>
 * Copyright (c) 2009 Malachi de AElfweald (malachid@gmail.com)
 * <p/>
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated
 * documentation files (the "Software"), to deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to the following conditions:
 * <p/>
 * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the
 * Software.
 * <p/>
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
 * WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
public class Variable<DATA,FITNESS>
extends Terminal<DATA,FITNESS>
{
	private static final ConcurrentHashMap<String, ConcurrentHashMap<String,Object>> dataset = new ConcurrentHashMap<String,ConcurrentHashMap<String,Object>>();
	private String variableSet;
	private String variable;

	public Variable(String variableSet, String variable)
	{
		this.variableSet = variableSet;
		this.variable = variable;
		
		if(dataset.get(variableSet) == null)
			dataset.put(variableSet, new ConcurrentHashMap<String,Object>());
	}

	@SuppressWarnings("unchecked")
	public static <DATA> DATA get(String variableSet, String key)
	{
		return ( DATA ) dataset.get(variableSet).get(key);
	}

	@SuppressWarnings("unchecked")
	public static <DATA> void set(String variableSet, String key, DATA data)
	{
		dataset.get(variableSet).put(key, data);
	}

	@SuppressWarnings("unchecked")
	public static <DATA> ConcurrentHashMap<String,DATA> getMap(String variableSet)
	{
		return ( ConcurrentHashMap<String,DATA> ) dataset.get(variableSet);
	}

	@Override public boolean isPopulated(){
		return true;
	}

	@Override public String getDisplayString(){
		return String.format(" %s ", variable);
	}

	@SuppressWarnings("unchecked")
	@Override public Variable<DATA,FITNESS> newInstance(){
		return getClass().cast( new Variable(variableSet, variable) );
	}

	@SuppressWarnings("unchecked")
	public DATA execute()
			throws ProgramException
	{
		/**
		 * fails in JDK6 without the generics here
		 * http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6302954
		 * works in JDK7 without them
		 */
		return this.<DATA>get(variableSet, variable);
	}
}
